A New Compact Finline OMT Based on Multi-Section Transformer
Keywords:
Compact, finline OMT, millimeter wave application, multi-section transformerAbstract
In the millimeter wave band, the simplification of the orthomode transducer (OMT)’s structure and processing technic is placed in a more important position. The finline OMT can meet the requirement, but its size is usually not compact enough. To solve this problem, a compact finline OMT based on multi-section transformer is presented. Such OMT can enable size reduction by reasonably designing three transformers to reach the matching condition, which makes the design more flexible. As a result, the -20dB reflection bandwidth of the proposed OMT is 30.2 GHz to 49.8 GHz (49%), while the lengths of main arm’s and side arm’s transition for vertical polarization are 1.35lambdamax and 0.9lambdamax (lamdamax denotes the maximum free space wavelength in band), respectively, which has been greatly reduced compared with the traditional ones. To verify the working performance of the design, a prototype is fabricated and measured. Finally, some assembly errors are analyzed to study its influence. The results show that the proposed OMT can be a good candidate for millimeter wave application.
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References
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